Firewall rule reviews — Equal-width histogram + Explicit missing-value fill: Equal-width histogram + Explicit missing-value fill for supplied firewall rule reviews records (rules_reviewed, rules_removed). Up to 200 rows; 2 independent reports using shared local analytical engines. No live lookup, prediction, professional assessment or external action. 0.01 USDC includes 2 supplied-data reports for up to 200 rows.